54 AVES. 



dible straight : nostrils basal, pierced in a membrane, more 

 or less exposed : wings short, or moderate ; first quill very 

 short, sometimes almost abortive; third, or third and 

 fourth, generally the longest. 



(1. ERITHACA.) Bill rather strong, as broad as high at the base; 

 gonys slightly ascending : rictus with long weak diverging bris- 

 tles: tarsi slender, somewhat elongated: wings moderate ; fourth 

 and fifth quills longest : tail divaricated ; the tips of the feathers 

 pointed. 



(2. PHCENICURA.) Bill slender, as broad as high at the base: rictus 

 nearly smooth : tarsi moderate : wings rather long ; third and 

 fourth quills longest : tail even ; the feathers obtuse, and ge- 

 nerally rufous. 



(3. SALICARIA.) Bill very slender, broader than high at the base i 

 rictus with long diverging bristles : tarsi moderate : wings short, 

 and somewhat rounded ; first quill nearly abortive ; third long- 

 est : tail cuneiform ; the tips of the feathers rounded. 



(4. PHILOMELA.) Bill rather strong, as broad as high at the base; 

 gonys slightly ascending : rictus with a few short bristles : 

 tarsi elongated : wings moderate ; third and fourth quills long- 

 est : tail with the two middle feathers longest ; the tips of all 

 rounded. 



(5. CURRUCA.) Bill rather strong, broader than high at the base ; 

 gonys slightly ascending : rictus nearly smooth : tarsi moderate : 

 wings moderate ; first quill nearly abortive ; third longest : tail 

 slightly forked. 



(6. SYLVIA.) Bill very slender, broader than high at the base : 

 rictus with a few longish bristles : tarsi rather elongated : wings 

 moderate ; third and fourth quills longest : tail slightly forked ; 

 the tips of the feathers rounded. 



19. MELIZOPHILUS. Bill very slender, short, 

 slightly arched from the base, compressed, with the tip 

 finely emarginated; tomia of both mandibles inflected to- 

 wards the middle : rictus with a few bristles : tarsi strong, 

 longer than the middle toe : wings short ; first quill very 

 small ; third, fourth, and fifth, equal and longest : tail 

 much elongated, cuneiform. 



20. REGULUS. Bill very slender, subulate, straight, 

 compressed throughout its whole length ; the tomia inflected 

 inwards : nostrils concealed by small bristly feathers directed 

 forwards : tarsi rather long : wings with the first quill very 

 short ; second much shorter than the third ; fourth and fifth 

 longest : tail moderate ; divaricated, the tips of the feathers 

 pointed. 



